What does the phrase "going well in the soft" mean?

Does anyone know what does this phrase mean: "Piper going well in the soft, lads. Down to fourth". I think it was about bets. The phrase was from a tv series "Peaky Blinders".


Yes, it refers to how soft the ground is at the racecourse. Some horses like a hard track, others prefer soft - and are often referred to as 'mudlarks'.